The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2009
Filed:
Feb. 26, 2008
Dirk Baranowski, Holzheim a. Forst, DE;
Christian Borgmann, Lappersdorf, DE;
Klaus Hengl-betz, Regensburg-Schwabelweis, DE;
Thorsten Lauer, Holzheim a. Forst, DE;
Dirk Baranowski, Holzheim a. Forst, DE;
Christian Borgmann, Lappersdorf, DE;
Klaus Hengl-Betz, Regensburg-Schwabelweis, DE;
Thorsten Lauer, Holzheim a. Forst, DE;
VDO Automotive AG, Regensburg, DE;
Abstract
A first energy control unit has a pilot controller with an applied setpoint energy and outputs a pilot control signal, and a regulator outputting a regulator signal as a function of the setpoint energy and an actual energy of the piezo actuator. The energy control unit creates a control signal representative for a current threshold of a charge current, depending on the pilot control and regulator signals. Furthermore, there is a second energy control unit for another setpoint energy and another control signal. A power output stage sets a charge current for the piezo actuator as a function of the predetermined control signal and performs this for the predetermined time. A scheduling unit predetermines, for setting the setpoint energy, the control signal and the time to the power output stage, and for setting the another setpoint energy, the another control signal and the time to the another power output stage.